Yeah, I agree.
We have a few people that used to train with us, then left suddenly and opened up their own dojang a few miles down the road. They also said a lot of bad things about me and my club. However, one of my students was shocked last night when I said that if they came back to our club I'd still teach them. She thought they'd burned their bridges.
I said as a senior, it's my job to teach people that the right way is inclusion and forgiveness not exclusion and holding on to grudges. It's like a parent disowning a child for wrongs they may have done. The child may need to "make up" for the wrongs done, but the parent shouldn't write them off.
How seniors treat juniors though is much less forgivable for me (because they should know better and be setting the example).
Just my viewpoint, but it has changed over the years and probably matches Korean feelings quite well at this point.